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CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Parenthetical) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Income Statement [Abstract] |  |  |
Accumulated other comprehensive income reclassification for change in fair value of interest rate swap agreements | $ (151) | $ 127 | $ 276
Accumulated other comprehensive income reclassifications for net realized gains on available-for-sale securities | 52 | 651 | 783
Accumulated other comprehensive income reclassifications on employee benefits | (174) | (113) | (43)
Income tax expense | $ 79 | $ 134 | $ 116

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